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(No Model.)

W. P. HOYT. SPRING BREAK FOR HOE DRILLS.

No. 537,419. Patented Apr. 9, 1895.

V itnesssas: lnu ntor,

PATENT OFFICE.

WILL F. HOYT, OF DOWAGIAC, MICHIGAN, ASSIGNOR TO THE DOWAGlACMANUFACTURING COMPANY, OF SAME PLACE.

SPRING-BREAK FOR HOE-DRILLS.

SPECIFICATION forming part of Letters Patent No. 537,419, dated April 9,1895.

Application filed December 22,1894. Serial No. 532,664. (No model.)

.To all whom, it may concern.-

Be it known that I, WILL F. HOYT, a citizen of the United States,residing at the city of Dowagiac, in the county of Cass and State ofMichigan, have invented certain new and use tooth to the main part of ahoe drill.

The so called spring break attachments are devices constructed to takethe place of the wooden pegs that have heretofore been inserted which,when unnecessary strain has been brought to bear upon the hoe or toothof the grain drill, would break and allow the tooth to swing backwithout breaking the machine or causing undue strain upon any part ofit.

My invention relates todevices in which the wooden peg referred to issuperseded by a metallic spring in connection with a lever; the leverbeing so positioned that the force of the spring, when the hoe or toothof the drill is in the proper position for work, acts at great advantageupon the same and holds it in position by the lever being positionednear the dead center; but when great strain is brought to bear, thelever is moved off from the center causing stress to be put upon thespring and the movement of the lever oi the dead center destroys theadvantage of the spring over the lever so that the tooth swings readilyback until the obstruction is passed, and then is brought back toposition by the tension of the spring, when it is substantially lookedas before and will act in the same manner until some other heavyobstruction, as a root or a result by securing the full benefit of thespring used. I accomplish these objects of my invention by the deviceshown in the accompanying drawings, in which- Figure 1 is a sideelevation of a drill tooth and draw-bar embodying my improvements.

Fig. 2 is a top elevation of the same. Fig. 3 is a sectional view online 3-3 of Fig. 1. Fig. 4 is a sectional view on line 44 of Fig. 3.

Similar letters of reference refer to similar parts throughout theseveral views.

Referring to the lettered parts of the drawings, D represents a smallcasting which is attached to the forward frame work of the drill on anysuitable cross bar. The drawbars, A, A, are pivoted to this casting andextend back to the hoe or tooth where they are pivoted to the tooth bythe bolt, 1', through the bracket, K. Any suitable means, asthe bar, J,can be used for raising the draw-bar and tooth out of the ground. To theunder side of the draw-bar, a bracket, C, is attached in any convenientmanner. Toward the front of the draw-bars, is pivoted a small casting,E, which is pivoted at 1', between the two draw-bars, A, A, a portion ofthe casting projectin g down between the two halves, A, A, of thedraw-bar for that purpose. The casting has two lateral projectingportions, n, n, which project out over the top of the draw-bars; andtheir connection with the interior portion forms a stop which allows thecasting to rest upon the top of the draw-bars, A, and is held inposition in that way. For convenience of description, the casting, E,will be referred to hereinafter as the lock.

The spring rods, B, are looped over the projecting parts, or bosses n ofthe lock, E, so that a pivotal connection is formed between the springrods, B, and the lock, E. To the front side of the hoe or tooth, A, is aprojecting bracket K, cast integral with said tooth which contains aseries of holes to permit of the adjustment of the tooth, A, to theproper angle. A bolt, 25, passes through one of the holes in thisbracket and through the eyes at the rear ends of the rods, B, B. Thereare two of the rods, B, one to each side of the draw-bars, A, A. Theseare connected by suitable eyes over the bosses, n, to the lock, E, andat their rear end to the brackets, K, as I have specified; and they passunder suitable depressions in the bracket, 0, which serve as guideways,and the bracket, 0, also serves as a fulcrum so that the rods, B, B, actas spring levers.

The center of the pivot, r, is a little distance below a line passingthrough the center of the bearing of the front end of the rod, B, and onthe lock, E, when the lock is in position, indicated byfull linesin thedrawings, andthrough the centerof the rod, B, on the bracket, 0. Inoperation, my improved drill is adjusted so that the tooth is at theangle required. When passing through the ground, when it meets anobstruction (as a root oraheavy stone) it will act on the tooth as alever. The fulcrum is at t with the load at t, and will tend to draw therods, 3, B, back. When the force becomes sufficient, the front of thelock, E, will pass up over and back into the position indicated bydotted lines turning on pivot, r. This is due to the fact that the linebetween the center of attachment of the rod, B, to the casting andthrough the center of the rod on the bracket, 0, is higher than thecenter of the pivot, r, and, as soon as the casting rises, the advantageof the leverage of the tooth is very much increased and allows the toothto swing back with comparative ease, the rods, B, B, being bent into theposition indicated by dotted lines and the tooth swinging back, as

is also indicated by dotted lines. When the obstruction is passed, thetension of the springs, B, B, returns the tooth to the originalposition, and the lock casting, E, swings over to its position againstthe draw-bars, A, 0wing to the action of the spring. It will thus beseen that very little strain is brought upon the springs, B, B, onlysufficient to bend them the short distance indicated by dotted lines inthe drawings, so that the wear and tear upon the springis very slight,owing to the pivotal connection at both ends.

In spring breaks, as heretofore constructed, one end or the other of thespring has usually been made rigid which, of course, puts great strainupon the end so secured making it necessary to use a very heavy springto accomplish the result; but, with my improved device, by pivoting thespring and introducing the bracket, 0, I accomplish the result with acomparatively light spring. The spring rods used by me are only fivesixteenths of an inch in diameter, made of spring metal. Thisaccomplishes the same result with a reduction in weight of the apparatusand adds very little to the weight over the old style drill where woodenpegs are used. My improved device afiords free adjustment of the toothin combination with the spring break. I have shown in the drawings atooth with aprovision made for both the spring break and also for thewooden peg break, but that relating to the wooden peg break is no partof this invention and can be dispensed with. I prefer both to insureease in repairs.

Having thus described my improved spring break for hoe drills, I desireto say that it is capable of considerable variation without departingfrom my invention. I also call attention to the fact that it can be usedin combination with ordinary cultivator teeth or wherever it isnecessary to have a break on the teeth of agricultural implements toprevent injury.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a grain drill, the'conibination of the draw-bars, A, A; the drilltooth, A, pivoted by its upper front portion thereto; the lock casting,E, pivoted between said draw-bars, A, A, at a"; and the bracket, 0,between said lock casting and said tooth attached to the draw-bars,.A;the spring rods, B, pivoted to said lock casting at n and to the drilltooth, A, at K; all co-acting together, substantially as described forthe purpose specified.

2. In a grain drill, the combination of the draw-bars, A, A"; the drilltooth, A, pivoted by its upper front portion thereto; the lock casting,E, pivoted between said draw-bars, A, A, at r; and the bracket, 0,between said lock casting and said tooth attached to the draw-bars, A;the bracket, K, on the front side of said tooth with a series of holestherein for adjustment; the spring rods, B, pivoted to said lock castingat n and to the bracket, K, on the drill tooth, A; all co-actingtogether, substantially as described for the purpose specified.

3. In a grain drill, the combination of the draw-bar; a tooth pivoted tosaid draw-bar; a lock pivoted toward the front part of said draw-barwith a stop thereon adapted to engage said draw-bar so as to hold themain part of said lock above its pivot; a bracket on the under side ofsaid draw-bar; and a spring rod pivoted to said lock casting and to thetooth and passing under the bracket on the under side of the draw-barand pressing normally against said bracket, the pivotal connection ofthe lock and draw-bar being slightly below a line passing through thepivotal connection of the rod to the lock and through the center of therod on the bracket below the draw-bar, for the purpose specified.

4. In a grain drill, the combination of the draw-bars, A, A; a tooth, A,pivoted to said draw-bars; and a lock, E, pivoted at 1, toward the frontpart of said draw-bars with a stop thereon adapted to engage the upperside of said drawbars so as to hold the main part of said lock above itspivot; abracket, C, on the under side of said draw-bars; spring rods, B,B, pivoted to said lock casting, E, and to the tooth, A, and passingunder the bracket, 0, on the under side of the draw-bars and pressingnormally against said bracket; the pivotal connection of the lock and"draw-bar being slightly below a line passing through the pivotalconnection of the rods to the lock and through the center of the rods onthe bracket, 8, below the draw-bar, for the purpose speci 5. In a graindrill, the combination of the draw-bar; a tooth pivoted to saiddraw-bar; a locking block pivoted to said draw-bar; a spring rod pivotedto said locking block and to said tooth below its connection with thedraw-bar; and a bracket projecting down from said draw-bar against whichsaid rod normally presses; and suitable means of holding said lock blockso that the line of connection of the rod and the lower point of thebracket will be slightly above the point of pivoting of the lock blockso that the locking block shall swing up and back when sufficientpressure is applied to the tooth below to permit the tooth to passobstructions and so that the force of the spring shall swing the toothback'into position after the obstruction is passed, as specified.

6. In a grain drill, the combination of the draw-bar, of a tooth pivotedto said draw-bar; a locking block pivoted to said draw-bar; a

spring rod pivoted to said locking block and connected to said toothbelow its connection with the draw-bar; a bracket projecting down fromsaid draw-bar against which said rod normally presses; and suitablemeans of holding said lock block so that the lock block shall swing upand back when sufficient pressure is applied to the tooth below topermit the tooth to pass obstructions and to put stress upon the springto swing the tooth back into position after the obstruction is passed,as specified.

7. In a grain drill, the combination of the draw-bar; a'tooth pivoted tosaid draw-bar; a lock pivoted toward the front part of said draw-barwith a stop thereon adapted to engage said draw-bar so as to hold themain part of said lock above its pivot; a bracket on the under side ofsaid draw-bar; a spring rod pivoted to said lock casting and connectedto the tooth below its connection with the draw-bar and passing underthe bracket on the under side of the draw-bar and pressing normallyagainst it, the pivotal connection of the lock and draw-bar beingslightly below a line passing through the pivotal connection of the rodto the lock and through the center of the rod on the bracket below thedraw-bar, for the purpose specified.

In witness whereof I have hereunto set my hand and seal in the presenceof two witnesses.

WILL F. I'IOYT. [L.S.]

Witnesses:

F. J. WILBUR, 1-1. G. JONES.

